A district court denied EPA's motions to dismiss a lawsuit brought by two states and a Native American tribe seeking to recover response costs from the 2015 Gold King mine spill that sent millions of gallons of acid mine drainage into the Animas and San Juan Rivers. EPA argued that it retained sover...

A district court dismissed a conservation group's suit to block the Department of Homeland Security from constructing a border wall near the National Butterfly Center in southern Texas. The group argued that the Department violated the Fourth Amendment by entering the Center without consent or warra...

The Ninth Circuit affirmed a district court's dismissal of a constitutional challenge to California's 2015 Low Carbon Fuel Standard (LCFS). Farming groups argued that the state's LCFS violated the Commerce Clause and the federal structure of the Constitution by regulating extraterritorially. But the...